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SubjectRe: [PATCH 05/10] kbuild: sort the list of symbols exported by the kernel (__ksymtab)
On Tue,  3 Nov 2009 10:06:17 +0000
Alan Jenkins <alan-jenkins@tuffmail.co.uk> wrote:
> modpost of vmlinux.o now extracts the ksymtab sections and outputs
> sorted versions of them as .tmp_exports-asm.S. These sorted sections
> are linked into vmlinux and the original unsorted sections are
> discarded.
>
> This will allow modules to be loaded faster, resolving symbols using
> binary search, without any increase in the memory needed for the
> symbol tables.
>
> This does not affect the building of modules, so hopefully it won't
> affect compile times too much.
>
> Minimally tested on ARM under QEMU emulator.
> Build tested on blackfin; output of "size -A" unchanged.

I'm getting a segfault from write_exports().

(gdb) bt
#0 0x0000003e5f075510 in strlen () from /lib64/libc.so.6
#1 0x0000003e5f045cb8 in vfprintf () from /lib64/libc.so.6
#2 0x0000003e5f06683a in vsnprintf () from /lib64/libc.so.6
#3 0x0000000000401897 in buf_printf (buf=0x7fff5514f5e0,
fmt=0x7fff5514f4e0 "0x%02x ") at scripts/mod/modpost.c:1692
#4 0x00000000004042c8 in main (argc=1024, argv=0x7fff5514f5e0)
at scripts/mod/modpost.c:2063
(gdb) f 4
#4 0x00000000004042c8 in main (argc=1024, argv=0x7fff5514f5e0)
at scripts/mod/modpost.c:2063
2063 buf_printf(&buf, "__EXPORT_%s_SYMBOL(%s,"
(gdb) p sym
$1 = (struct symbol *) 0x65c9f0
(gdb) p *sym
$2 = {next = 0x64c3a0, module = 0x610010, crc = 4077789248, crc_valid = 1,
weak = 0, vmlinux = 0, kernel = 0, preloaded = 0, function = 1,
export = export_unknown, name = 0x65ca10 "simple_prepare_write"}
(gdb) p sym->export
$3 = export_unknown
(gdb) p/d sym->export
$4 = 5
but section_names[] (which could be static in write_exports() btw) has
only five entries.


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